Apparatus for mounting dies



Aprll 14, 1 931. H. P. ARKEMA ET Al.

APPARATUS FOR MOUNTING DIES Filed Dec. l0 1928 5am rmS y www M nrr @AM.wpd /n//mw @Mmc/J Patented Apr.. 14, 1 931 UNITED STATES'v PATENTaOFFICE HAROLD PETER ARKEMA AND SIGURD THBONSEN, F CHICAGO, ILLINOIS,ASSIGNORS T0 WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y.,A COR- PORATION o1; NEW Yom:

APPARATUS FOR MOUNTING- DIES @riginal application filed July 19, 1926,Serial No.. 123,274. Divided an'ti'this application led December 10,1928. Serial No. 324,965.

This invention relates to apparatus for mountingl dies, and moreparticularly to apparatus for mounting diamond wire drawing dies, and isa division of our application, Serial No. 123,274, filed-July 19, 1926,

which issued as Patent No. 1,701,656 on v February 12, 1929.

In the art vof wire drawing it has been the practice in some instancesto mount a wire drawing member, such as a diamond die, by castingsuitable supporting material around the die and thereby rendering'itreadily adaptable for attachment to a wire drawing machine.- Experiencein this particular art has shown that care must be exercised in castingmolten material about a diamond die in order to prevent the cracking ofthe die dueto the heat from the molten material. Voids or interstices'are sometimes present upon the surfaces of the dies, which are to bemounted, and 1n the event that such voids are present, it is verydesirable that the material be cast around.

.represented by an apparatus which includes a heating element comprisedof electrical current conducting material, such as carbon in contactwith the terminals of a pair of carbon conductors which are connectedwith a suitable source of supply and are designed to carry current ofhigh amperage. Means is provided whereby a diamond die maybe pro erlypositioned within a cavity or mold of t e heating element and suitablemounting or supporting material, such as particles of a nickel-ironalloy, may be introduced within the cavity around the die. Currentksupplied from the source will raise the tem- Fig. 1 is a plan view ofan apparatus Y embodying the invention;

Fig. 2 is a transverse vertical section thereof taken on the line 2-2 ofFig. 1.

Fig. 3 is an enlarged fragmentary vertical section of the heatingelement as disclosed in Fig. 2, disclosing a diamond die positionedwithin the mold thereof, said mold being shown without a charge ofmounting material;

Fig. 4 is a horizontal fragmentary section taken on the line 4-4 of Fig.3, discloing a plan View of the heating element, an

Fig. 5 is 'a detailed sectional view taken on the line 5-5 of Fig. 1disclosing a terminal clamping member.

Referring now to the accompanying drawing, wherein like referencenumerals are employed to designate similar parts throughout the variousdisclosures, la rectangular base plate 10 comprised of suitableelectrical insulating material has mounted upon its upper surface a pairof parallel support bars 11 which are channeled as shown at 9 to re-lceive companion carbon conductor blocks 12. These conductor blocks 12are seated within the channeled portions of the support bars 11 and aresecured in position by means of clamping means 14 comprising an invertedU-shaped member 15 and a pair of tightening screws 16. The lowerextremities of the U-shaped members 15 are slidably mounted within ways18 formed along the sides of the support bars 11. By tightening thescrews 16 against the surface of a metallic plate 19 (Fig. 2) whichrests upon the upper surface of each ofthe carbon blocks 12, the blocksmay be effectively secured against longitudinal displacement. Theseplates 19 are connected with the terminals of suitable conductors 20which are connected with any suitable source of electrical currentsupply (not shown).

Interposed between the forward extremities of the carbon blocks 12 andresting upon the base plate 10 is a. carbon support block 22 for a.carbon resistor or heating element 23. This heating element is providedwith a cavity' or mold 25 and the opposite Sides of the heating elenientare designed to be engaged by and clamped between the opposed adjacentsurfaces of the forward extremities of the carbon blocks 12 by clampingdevices 26. Each clamping device 2G includes a screw member 28 threadedthrough a bracket 2S) suitably mounted upon the base plate 10. The outerextremity of each screw 28 supports a hand wheel 30 and the innerextremity thereof supports a head 31 slidably mounted thereon. Uponturning the hand wheel 30 after the heating element 23 has beenpositioned upon the carbon support block 22, the heads 31 engage withthe outer sides of the adjacent carbon blocks 12 and move said carbonblocks together sufficiently to positively engage with the sides of theheating element.

vSubsequent to the clamping of the heating element 23 between the carbonblocks 12 a carbon pedestal 33 may be placed within the cavity 25centrally thereof upon the upper surface of the carbon support block 22.A diamond or diamond die 34 (Fig. 3) having a central bore 35 may thenbe placed upon the positioned carbon pedestal 33. A bracket 37 securedto the base plate 10 provides a mounting for a vertical centeringclement 38 threaded therein. By turning a hand wheel 39 at the upper endof the centering element 38, the lower pointed extremity thereof may bemoved into the bore 35 of the positioned die 34, thereby rigidlysecuring the die Within the cent-ral portion of the cavity 25. l

Having thus been secured in position within the cavity 25 the die 34 maybe surrounded by finely divided particles of mounting material 41 (Fig.2). It has been found by experimentation that a nickel-iron alloycomprising preferably not more than 7 nickel provides a verysatisfactory mounting for diamond dies and this alloy in the form ofparticles may be readily placed within the cavity 25. Closing theelectrical circuit containing the carbon blocks 12 and the mold member23 by any suitable switch (not shown) permits a current flow of highamperage through the heating element 23, thereby heating the elementsufliciently to fuse the mounting material 41 Within the cavity 25.Melting the nickel-iron mounting material about the die 34 in thismanner causes any voids or interstices which may be present upon thesurface of the die to be filled completely by the molten material. Thecurrent flow through the element 23 need only be of veryl short durationand after the mounting material 41 has been completely fused and castabout the die 34 in the form of a mantle it is allowed to cool slowly inorder to insure against cracking and to prevent rapid oxidation ofthecarbon heating element 23. The centering element 38 may now bedisengaged from the die 34 and the clamping devices 26 may be actuatedto release the heating element 23. The solidified mounting material 41may be'readily removed from the heating element 23 and the element mayagain be replaced in position upon the support block 22 and clamped iniosition to receive another unmounted die.

t will be noted that the heating element 23 is formed (Fig. 4) witharcuate portions 42 which partially encircle the mold 25 and by thisconstruction the heat generated by the current ow through these arcuateportions is effectively concentrated about the mounting material '41placed within the mold 25. 'After the mounting material 41 has beenallowed to cool and is removed from the heating element 23 the mounteddie may be trimmed or machined and subsequently attached in any suitablemanner to a wire drawing machine. y

It is to be understood that by the use of this improved apparatus formounting dies, no pressure need be applied to the mounting materialsubsequent to its being fused, as has heretofore been the practice insome instances, for the purpose of preventing theJ formation of airholes or voids Within the mounting material adjacent to the die.` Fusingthe material in position around the die 34 causes any gases which may bepresent to be positively driven off and When the mounting materialsolidifies, the covered portion of the die will be in direct contactwith the material, thereby presenting a very rm mounting or mantle.

' Although the invention as herein illustratedA and described isparticularly Well adapted for use in connection with the mounting ofWire drawing dies, it should be understood that the novel featuresthereof are capable of other applications and should be limited only bythe scope of the appended claims.

What is claimed is:

1. In apparatus for mounting dies, an electrical conductor comprising amold for receiving material to be fused, a pair of conductor blocksadjacent the mold, means for spacing the blocks, and means forsupporting a bored die Within the mold and for closing the bore endsthereof. Y

2. In apparatus for mounting dies, a pair of carbon terminal members, asupport block therebetween, a carbon element sup ported by the block andcomprising a mold for receiving material to be fused, means fordetacliably mounting the carbon element between and in contact with thecarbon terminals, and means for supporting a forming diel within themold.

3. In apparatus for mounting dies', a substantially circular memberhaving enlarged diametrically opposed portions and a cavity forreceiving a die and material to be fused, means for positioning the diein the material, and means engaging the enlarged portions of the memberfor effecting the fusing of the material around the die.

4. In apparatus for mounting dies an electrical heatingelement comprisina mold for receiving material to be fuse means for supporting a diewithin the mold, and means for supplying electrical current to theelectrical heatin element.

5. In apparatus for mounting dies, a

substantially circular carbon element havin enlarged diametricallyopposed portions an a cavity for receiving material to be fused, meansfor positioning a die within the cavity, and means engaging the enlargedportions of the carbon element for passing an electrical heating currentthrough the car- (bpn element to fuse the material around the e. v 6. Inapparatus for mounting dies, a substantially circular carbon elementhaving enlarged diametricall opposed portions and a cavity for receivlnga supply of material to be fused, means for positioning a die within thecavity, and means for passing electrical current through ,the carbonelement to heat it.

7. In apparatus for mounting dies, an electrical heating element comosed of carbon having a cavity therein or receiving material to befused, means for sup orting a die within the cavity, and means orconducting electricity to the element to heat it. In an apparatus formounting dies, anelectrical circuit including a pair of conductorblocks, a conducting supporter block spaced therefrom and a heatingelement comprising a mold connecting the conductor blocks and thesupporter block.

9., In an apparatus for mounting dies, a substantially circular heatingelement having anenlarged portion and a cavity for receiving material tobe fused, means for positioning a die within the cavity and a conductorblock engaging the enlarged portion for heating the element.

In witness whereof, we hereunto subscribe our nalnes this 28th day ofNovember, A. D. 1928. A

HAROLD PETER ,ARKEMA. SIGURD THRON SEN.

